Anaerobic co‐digestion of dairy manure and Japanese knotweed (Fallopia japonica) under thermophilic condition: Optimal ratio for biochemical methane production

Abstract

Anaerobic co‐digestion of animal manure and lignocellulosic biomass is a potent approach for sustainable biomethane production. Co‐digestion of dairy manure (DM) and Japanese knotweed (JK), which was collected from a riverbank, was investigated at five different DM‐to‐JK mixing ratios (100:0, 90:10, 80:20, 60:40, and 0:100; wet weight basis) under thermophilic condition. The results showed that the methane yields obtain from the co‐digestion of DM and JK were much higher than that obtained from JK alone (104 ml/gVS), which indicates the synergistic effect and the benefits of co‐digesting JK with DM. The highest methane yield (232 ml/gVS) was obtained from the DM‐to‐JK ratio of 90:10, which was 14.9% and 123.1% higher than that from DM and JK alone, respectively. It also showed the highest synergistic effect (61 ml/gVS). However, further increase in JK ratios led to the decrease in methane yield and synergistic effect. Therefore, applying the co‐digestion of DM and JK at a ratio of 90:10 is recommended for biomethane production.

Invasive Plants in Support of Urban Farming: Fermentation-Based Organic Fertilizer from Japanese Knotweed

“…F. japonica is known for its participation in numerous ecosystem services [19][20][21][22]. However, as an invasive species, it causes significant structural and functional changes in urban and rural ecosystems [1][2][3][4][5][8][9][10].…”

“…japonica is also known for its numerous ecosystem services. The aerial or underground parts of F. japonica show insecticidal [17] and fungicidal potential [18], and have been successfully used in the production of medicine [19], biofuel [20], briquettes for heating [21], paper cellulose fibers [22], textile [23], and as carbon (C) adsorbent [24]. In some of these production processes, the aerial parts of the plant went unused and were disposed of in landfills, although these parts weigh more than half the total mass of the plants [12,19].…”

High-Solid Anaerobic Digestion: Reviewing Strategies for Increasing Reactor Performance

“…Agricultural residues with a high lignocellulosic content and a low moisture content may represent an excellent potential energy resource [82] to produce biogas as a valuable fuel if the proper conversion can be attained at a reasonable cost under a solid-state configuration. In addition, co-digestion with manures may take advantage of the synergistic effects reported by several authors [83][84][85][86], particularly when the solid content of the system is increased. However, some difficulties still need to be solved, such as the higher degradation time needed, the high inoculation rate required to start up this process, and the low degradability of lignocellulosic biomass.…”

New Approaches on Japanese Knotweed (Fallopia japonica) Bioactive Compounds and Their Potential of Pharmacological and Beekeeping Activities: Challenges and Future Directions

“…While Japanese knotweed can have a significant negative impact on its surrounding environment, including the endangerment and extinction of local species [33,36], effecting crop production [37], human health [38][39][40], forest regeneration [35,40] and urban and rural land management [41], this invasive plant also has several positive aspects. Reports in the literature show that Japanese knotweed can have a positive influence in terms of its use as food and fodder [39,42], medicine [10,[43][44][45], fuel [46] and bioenergy [47,48], as well as an ecological indicator [49], insecticidal and fungicidal product [50][51][52], organic fertilizer [12] or carbon adsorbent [53]. These latest positive uses of F. japonica can act both as a preventive method for its invasiveness, as well as a pathfinder for further and innovative utilization of this troublesome plant species in the current circular economy.…”